The need of intelligent implant materials for applications in the area of minimally invasive surgery leads to tremendous attention for polymers which combine degradability and shape-memory capability. Application of heat, and thereby exceeding a certain switching temperature Tsw, causes the device to changes its shape. The precise control of Tsw is particularly challenging. It was investigated how far the glass transition temperature Tg of amorphous polymer networks based on star-shaped polyester macrotetrols crosslinked with a low-molecular weight linker can be controlled systematically by incorporation of different comonomers. The molecular weight of the prepolymers as well as type and content of the comonomers was varied. The Tg could be adjusted by selection of comonomer type and ratio without affecting the advantageous elastic properties of the polymer networks.
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Zotzmann, J., Kelch, S., Alteheld, A. et al. Ability to control the glass transition temperature of amorphous shape-memory polyesterurethane networks by varying prepolymers in molecular mass as well as in type and content of incorporated comonomers. MRS Online Proceedings Library 1190, 0109 (2009). https://doi.org/10.1557/PROC-1190-NN01-09